diff --git a/arch/x86/pci/mmconfig-shared.c b/arch/x86/pci/mmconfig-shared.c
index de6bf0e7e8f8..758cbfe55daa 100644
--- a/arch/x86/pci/mmconfig-shared.c
+++ b/arch/x86/pci/mmconfig-shared.c
@@ -461,7 +461,7 @@ static bool __ref is_mmconf_reserved(check_reserved_t is_reserved,
 	}
 
 	if (size < (16UL<<20) && size != old_size)
-		return 0;
+		return false;
 
 	if (dev)
 		dev_info(dev, "MMCONFIG at %pR reserved in %s\n",
@@ -493,7 +493,7 @@ static bool __ref is_mmconf_reserved(check_reserved_t is_reserved,
 				&cfg->res, (unsigned long) cfg->address);
 	}
 
-	return 1;
+	return true;
 }
 
 static bool __ref
@@ -501,7 +501,7 @@ pci_mmcfg_check_reserved(struct device *dev, struct pci_mmcfg_region *cfg, int e
 {
 	if (!early && !acpi_disabled) {
 		if (is_mmconf_reserved(is_acpi_reserved, cfg, dev, 0))
-			return 1;
+			return true;
 
 		if (dev)
 			dev_info(dev, FW_INFO
@@ -522,14 +522,14 @@ pci_mmcfg_check_reserved(struct device *dev, struct pci_mmcfg_region *cfg, int e
 	 * _CBA method, just assume it's reserved.
 	 */
 	if (pci_mmcfg_running_state)
-		return 1;
+		return true;
 
 	/* Don't try to do this check unless configuration
 	   type 1 is available. how about type 2 ?*/
 	if (raw_pci_ops)
 		return is_mmconf_reserved(e820__mapped_all, cfg, dev, 1);
 
-	return 0;
+	return false;
 }
 
 static void __init pci_mmcfg_reject_broken(int early)